Understanding a C++ Line of Code

Hi,

Im a C Sharp Developer mainly, and am converting some C++ code into C Sharp but have come across a line of code that has totally thrown me and I can work out what is it doing. The line is as follows.

define RANDCHANCE(a) ((((float)rand()) + 0.5)*(1.0/(float)RAND_MAX) <= a)

Now im not totally stupid. I know its creating a random number that is a float. Im guessing RAND_MAX is a C++ system varible, but thats not the main issue. I am confused by the RANDCHANCE(a) and <= a at the end. a is never assigned anywhere in the code.

Any help would be great.

Thanks for you time.

Regards

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